Mercurial > piecrust2

annotate piecrust/plugins/base.py @ 837:ad8f48a31c62

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assets: Fix crash when a page doesn't have assets.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 05 Feb 2017 22:52:01 -0800
parents bf9f4e55f751
children 7d83b9484b98
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
303
5dbab01daaba plugins: First pass for a working plugin loader functionality.
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1 import logging
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2 import importlib
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3
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4
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5 logger = logging.getLogger(__name__)
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7
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8 class PieCrustPlugin(object):
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9 def getFormatters(self):
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10 return []
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11
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12 def getTemplateEngines(self):
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13 return []
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14
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15 def getDataProviders(self):
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16 return []
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17
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18 def getProcessors(self):
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19 return []
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20
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21 def getImporters(self):
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22 return []
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23
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24 def getCommands(self):
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25 return []
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26
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27 def getCommandExtensions(self):
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28 return []
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29
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30 def getBakerAssistants(self):
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31 return []
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32
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33 def getSources(self):
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34 return []
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35
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36 def getPageGenerators(self):
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37 return []
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38
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39 def getPublishers(self):
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40 return []
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41
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42 def initialize(self, app):
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43 pass
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44
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45
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46 class PluginLoader(object):
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47 def __init__(self, app):
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48 self.app = app
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49 self._plugins = None
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50 self._componentCache = {}
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51
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52 @property
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53 def plugins(self):
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54 self._ensureLoaded()
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55 return self._plugins
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56
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57 def getFormatters(self):
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58 return self._getPluginComponents(
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59 'getFormatters',
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60 initialize=True, register_timer=True,
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61 order_key=lambda f: f.priority)
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62
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63 def getTemplateEngines(self):
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64 return self._getPluginComponents(
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65 'getTemplateEngines',
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66 initialize=True, register_timer=True,
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67 register_timer_suffixes=['_segment', '_layout'])
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68
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69 def getDataProviders(self):
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70 return self._getPluginComponents('getDataProviders')
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71
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72 def getProcessors(self):
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73 return self._getPluginComponents(
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74 'getProcessors',
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75 initialize=True, register_timer=True,
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76 order_key=lambda p: p.priority)
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77
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78 def getImporters(self):
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79 return self._getPluginComponents('getImporters')
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80
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81 def getCommands(self):
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82 return self._getPluginComponents('getCommands')
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83
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84 def getCommandExtensions(self):
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85 return self._getPluginComponents('getCommandExtensions')
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86
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87 def getBakerAssistants(self):
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88 return self._getPluginComponents('getBakerAssistants')
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89
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90 def getSources(self):
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91 return self._getPluginComponents('getSources')
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92
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93 def getPageGenerators(self):
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94 return self._getPluginComponents('getPageGenerators')
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95
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96 def getPublishers(self):
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97 return self._getPluginComponents('getPublishers')
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98
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99 def _ensureLoaded(self):
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100 if self._plugins is not None:
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101 return
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102
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103 from piecrust.plugins.builtin import BuiltInPlugin
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104 self._plugins = [BuiltInPlugin()]
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105
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106 to_install = self.app.config.get('site/plugins')
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107 if to_install:
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108 for name in to_install:
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109 plugin = self._loadPlugin(name)
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110 self._plugins.append(plugin)
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111
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112 for plugin in self._plugins:
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113 plugin.initialize(self.app)
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114
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115 def _loadPlugin(self, plugin_name):
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116 try:
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117 mod = importlib.import_module('piecrust_' + plugin_name)
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118 except ImportError as ex:
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119 logger.error("Failed to load plugin '%s'." % plugin_name)
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120 logger.error(ex)
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121 return
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122
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123 plugin_class = getattr(mod, '__piecrust_plugin__', None)
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124 if plugin_class is None:
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125 logger.error("Plugin '%s' doesn't specify any "
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126 "`__piecrust_plugin__` class." % plugin_name)
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127 return
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128
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129 try:
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130 plugin = plugin_class()
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131 except Exception as ex:
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132 logger.error("Failed to create plugin '%s': %s" %
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133 (plugin_name, ex))
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134 return
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135
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136 return plugin
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137
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138 def _getPluginComponents(self, name, *,
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139 initialize=False,
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140 register_timer=False,
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141 register_timer_suffixes=None,
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142 order_key=None):
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143 if name in self._componentCache:
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144 return self._componentCache[name]
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145
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146 all_components = []
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147 for plugin in self.plugins:
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148 plugin_components = getattr(plugin, name)()
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149 all_components += plugin_components
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150
0
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151 if initialize:
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152 for comp in plugin_components:
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153 comp.initialize(self.app)
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154
413
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155 if register_timer:
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156 for comp in plugin_components:
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157 if not register_timer_suffixes:
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158 self.app.env.registerTimer(comp.__class__.__name__)
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159 else:
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160 for s in register_timer_suffixes:
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161 self.app.env.registerTimer(
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162 comp.__class__.__name__ + s)
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163
7
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164 if order_key is not None:
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165 all_components.sort(key=order_key)
0
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166
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167 self._componentCache[name] = all_components
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168 return all_components
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169